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LNT 촉매에서 환원제 분사 조건에 따른 De-NO<SUB>x</SUB> 특성에 관한 실험적 연구
모지환(Ji-Hwan Mo),박영준(Young-Joon Park),송춘섭(Chun-Sub Song),윤여빈(Yu-Bin Yoon),이성욱(Seang-Wock Lee),조용석(Yong-Seok Cho) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
LNT(Lean NOx Trap) catalyst is an aftertreatment system typically used to reduce oxides of nitrogen(NOx) emissions for diesel engine. During the lean condition of exhaust gas, NOx is stored in the LNT catalyst and released and reduced during the rich condition of exhaust gas. In generally, rich condition of exhaust gas is made by post fuel injection or injection of the reductant such as CO₂, HC. The most effective method for de-NOx performance is an optimum injection rate of reductant as a function of exhaust gas condition. Injection rate of reductant made by diesel fuel has effected on the fuel economy and NOx reduction efficiency. This paper aimed to figure out evaluate to effect of exhaust gas temperature, O₂ concentration in exhaust gas and mass of reductant injection for de-NOx peformance of LNT catalyst using the test rig. Space velocity is held 30,000 h?¹ that is generally measured high reduction performance in catalyst. In result, NOx conversion efficiency is the highest when the specification temperature of exhaust gas and reduced NOx concentration in exhaust gas as injection rate of reductant increases. O₂ concentration in exhaust gas is 4%, NOx reduction efficiency is higher than 10% of O₂ concentration in exhaust.
모지환(Ji-Hwan Mo),박영준(Young-Joon Park),윤여빈(Yu-Bin Yoon),이성욱(Seang-Wock Lee),조용석(Yong-Seok Cho) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In an air induction system while vehicle is parked, evaporative emissions from the fuel in the intake port and injector nozzles diffuse to atmosphere through the air cleaner. In order to reduce the evaporative emissions, the HC trap which is composed an activated carbon is installed in the air cleaner box. This paper aimed to make a numerical model for evaluating absorbing performance of hydrocarbon in the HC trap. In order to make the model, a test rig is made for measuring the deviation of hydrocarbon concentration through the HC trap. Using the results, the mass of loaded HC in the HC trap is calculated.
전산해석을 통한 자동차용 공기청정기의 내부구조변화에 따른 내부유동변화에 대한 연구
임택규(Taek-Kyu Lim),조중원(Chung-Won Cho),원종필(Jong-Phil Won),이호성(Ho-Seong Lee),정영철(Young-Chul Jung),모지환(Ji-Hwan Mo) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In this paper, computerized analysis program, SC / Tetra by car air freshener in accordance with the structural changes of the internal flow rate and pressure for change was evaluated. The air flow velocity at the entrance to the all 62CMH same, each model and size of filter and air filter has a different angle between the direction of the flow conditions. Analysis of data on air permeability of the filter at the current NF Sonata vehicles equipped with an air purifier could be obtained through experiments based on flow NF Sonata, also on the basis of the vehicle air freshener to 15 CMH ~ 70 CMH 5 CMH unit increase were measured. Analysis of grid used in the Prism, Tetra has been used for more than a total of 2.2 million is composed of the elements. Prism layer of wall starts with an initial grid size of 1.1 times the growth rate was 3 layered configuration, all the other grid was composed of Tetra. The turbulence model is built from commercial CFD code, and the standard k-ε model was applied. In this study, for each model, the internal distribution of each filter of the velocity and pressure was tested via analysis of air fresheners to improve the durability of filter optimization can be predicted using the data.